The Act authorizes each bank of the System, subject to the collateral requirements of section 4.3(c) of the Act, to issue:

(a) Notes, bonds, debentures, or other similar obligations;

(b) Consolidated obligations, together with any or all banks organized and operating under the same title of the Act;

(c) Systemwide obligations, together with other banks of the System; and

(d) Investment bonds to the authorized purchasers subject to the limitations contained in the regulations set forth in subpart D.